Suna wo Kamu You ni...NAMIDA (砂を噛むように・・・NAMIDA; Like Chewing Sand...Tears) is Matsuura Aya's 19th single. It was released on February 1, 2006 under the zetima label in regular edition only. It sold 14,323 copies in its first week and 20,212 total. The Single V was released on February 8, 2006 and sold 5,822 copies total.